Blacksmith s punch



(No Model.) 2 Sheets-Sheet 1. W. P. HOLMAN.

BLAGIQSMITHS PUNUEL.

N0. 295,397. Patented Mar. 18, 1884.

2 sheets -sheet 2.

N A M L O H R W Y BLACKSMITHS PUNCH.

- Patented Mar. 18

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llnrrsn Secures r e'rnwr @rrrcno WILLlAlVI P. HOLMAN, OF HOWARD,GEORGIA.

BLACKSMITHS PUNCH.

SR'EGIFICATION forming part of Letters Patent No. 295,397, dated March18, 1884. duplication filed July 2, 71883. (No model.)

To all whom it may concern.-

Be it known that \VILLIAM PATRICK Hon MAN, a citizen of the UnitedStates, residing at Howard, in the county of Taylor and State 50fGeorgia, have invented a new and useful Improvement in BlacksmithsPunches, of which the following is a specification.

The-implement is designed for hand use with an anvil and hammer forpunching holes of circular or square form in metal. It is to supersedethe drill for general work; and its construction is such as to preventthe swelling or bursting of the metal in driving thepunchpin through it,and thereby permit holes to I be punched quite closetogether and quiteclose to the edge of the metal, which cannot be done with the ordinarypunch, especially in castiron. The punch-pin tapers upward from itscutting end, and is carried in a clampingsocket formed upon the end of aspringarm, which is preferably integral with a base-arm adapted toreceive a die upon which the metal is placed, so that the punch-pin isdriven first through the metal and then drops through the die and anopening in the base-arm with the punched-out plug. The opening in thedie dares to its bottom and opens into the opening in the base-arm, sothat the punched-out plug and the tapered punch-pin will fall freelythrough the die. It is the taper form of the driven pin or punch, inconnection withsupporting the plate or bar to be punched upon the faceof a die having a downward-flaring through-opening a little larger thanthe cut ting end of the tapering punch-pin, which prevents the burstingof the metal and gives a clean cut. The clampingsocketis intended onlyto hold the tapering pin in position to allow it to be driven downthrough said socket and through and free of the die, and to allow saidpin to be adjusted to suit the thickness of the metal to be punched, sothat the cutting end of the punch-pin will be held upon the metal toreceive the first blow, and will follow, down until it is driven throughthe clampingsocket and falls clear of the base-arm. The driven pin isreadjusted in theholding-arm by passing its small end first up throughthe flaring opening in the die from the bottom of the 5 basearni.

Referring to the accompanying drawings,

Figure 1 represents the punching implement in perspective; Fig. 2, avertical sectional elevation, showing the plate in position to bepunched; Fig. 3, a similar view, showing the driven punch fallingthrough the die, with the plug out from the plate. Figs. 4 and 5 aretapering punch-pins of cylindrical. and square form. Figs. 6 and 7 aredies of corresponding form; and Fig. 8 shows a plate with holes punchedclose together without bursting.

The implement is preferably forged from a bar of steel with a flat base,a, formed at one end with an upturned fiat spring, b, which terminatesin a rigid arm, 0, overhanging the flat base, and carries at its freeend the tapering pin or driven punch d, in a vertical position within aclamping-socket. The other end of the fiat base has an op ening, e, andis formed on its upper surface with a recessed seat, 6/, adapted toreceive and hold a die, f, having an opening corresponding in form but alittle larger than the cutting or largest end of the tapering drivenpin, and opening into thesaid base-opening. v f

The taperingpin punch cl may be of oylin- I drical or square form, buttapers upward from its cutting end, so thatin being driven through themetal it will make a clean cut, by means of being practically free fromthe walls of the opening being punched, and thereby prevent bindingwithin the punched hole. The face of the die is flush with the uppersurface of the basearm and the opening in the die flares downward, andopens into the base-opening e, "8 5 so as to allow the punch pin to bedriven through the die with the punched-out plug without binding. Thisprovision of separate, dies adapts the implement for use with diffenent'shaped punch-pins; but I may dispense 9 with the separate dies, andform the daring die-opening in the base itself.

The arm for carrying the punch-pin is split vertically at its free endto form a spring socket or clasp, it, within which the tapering 9 5punch-pin is clamped in by means of a yoke, t, driven over the slit armtoward the socket, so as to bind its socket end hard upon the upper ortapered end of the punch-pin, which projects above the arm to receivethe blows of the loo hammer. The punch-pin is 'set so as to bear uponthe article to be punched, and the spring of its carrying-arm allows itto descend as the hole is punched.

The fiat base and punch-pin-carrying arm are of suitable length, and thespring is formed by a flattened, bent, or curved part.

Any suitable power may be applied for driving the punch-pin, and thelatter may be secured in any suitable manner to its carryingarm; but theclamping-socket shown is preferred, because it allows the clamp to beopened to receive the punch-pin and easily bound upon and released fromit.

In using the implement, the die and punchpin to suit the desired form ofhole are secured in place, and the punch-pin adjusted to the thicknessof the metal, the implement be ing held by the left hand, with its flatbase upon the anvil. The plate to be punched is then held upon the dieby the right hand, and the punch'pin driven by an assistant workman,using a hammer. Care should be taken to raise the punch-pin-carrying armin placing the plate upon the die, so as not to strike against the endof the punchpin, which might place it out of proper vertical adjustment;but if properly set in the claniping'socket the punch-pin will not touchthe die in passing through it.

The provision described, broadly considered, for adapting the punch-pinto following and be discharged with the punchingthrough the die andthrough a base-opening eorresponding with the die is not claimed herein,as it is not new; nor is it intended to claim,

broadly, a spring-sustained punch; but my invention consists of thespecific implement herein described, having a punch-pin tapering fromits cutting to its driving end, held upon the plate to be punched by thepositive action of its spring-carrying arm, from the clasping endof'which it is driven, and operating with a die having a downwardflaring opening, whereby 15b prevent the binding of the punchpin in themetal, and swelling and bursting of the metal in driving the punchthrough it, and especially in punching plates near their edges. In theuse of the tapered punch carried .b an overhan in s JIlD clam )ing-armthe 1"! it! b c 7 punch-pin is adjusted in its clamp upward through thebase-opening in the die, and is set to bear upon the plate, which isplaced upon the die after the punch-pin is so set. This positive holdingof the punch-pin upon the plate is important in giving a truestartingcut and holding the punch-pin firmly upon the plate.

I claim 1. The Within-described punching implement, consisting of apunch-pin, d, tapering from its cutting to its driving end, a springarm,0, having a clamping-socket, a base-arm, a, joined to said spring-arm,and a die, f, having a downward-fiaring opening, the said punch pinbeing clamped directly by the spring-arm and held upon the plate to bepunched by the positive action of said springarm, substantially as setforth.

2. The punch-pin d, tapering from its cutting to its driving end, incombination with a clamping-arm, c, therefor, a die, f, having adownward-flaring opening, and a base-arm, a,

W. l HOLMAN. I

Witnesses:

D. A. CASTLEBERRY, J. B. FOWLER.

